HP 3PAR Operating System Software - Manual (Page 249)

Figure 70 (page 249) illustrates an SLD configuration in which the primary system, SystemA, goes
down. In this example, SystemB becomes the temporary primary system, and SystemC becomes
the backup system to SystemB. After this, SystemC becomes the primary system and SystemB
becomes the backup system.
NOTE: You can set up either backup system to assume the role of the primary system in the event
of failover.
Figure 70 Primary System Failure with SLD Remote Copy
Handling Primary System Failure 249